JN0-351 Exam with Accurate Enterprise Routing and Switching, Specialist (JNCIS-ENT) PDF Questions

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Juniper JN0-351 Exam Overview:

Certification Vendor:	Juniper Networks
Exam Name:	Enterprise Routing and Switching, Specialist (JNCIS-ENT) Exam
Exam Number:	JN0-351
Real Exam Qty:	65
Available Languages:	English
Related Certifications:	JNCIP-ENT JNCIA-Junos JNCIE-ENT
Exam Duration:	90 minutes
Exam Price:	$200 USD
Exam Format:	Multiple Choice
Passing Score:	Not publicly disclosed (approx. 65%-70%)
Certificate Validity Period:	3 years
Recommended Training:	Juniper Learning Portal
Exam Registration:	Pearson VUE Registration
Sample Questions:	Juniper JN0-351 Sample Questions
Exam Way:	Online proctored or onsite testing center (Pearson VUE)
Pre Condition:	Valid JNCIA-Junos certification
Official Syllabus URL:	https://www.juniper.net/us/en/training/certification/tracks/enterprise-routing-switching/jncis-ent.html

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Juniper JN0-351 Exam Syllabus Topics:

Topic	Details
Topic 1	Tunnels: The fundamentals of IP tunneling are emphasized, highlighting their requirements and functionalities. Mastery in configuring, monitoring, and troubleshooting tunnels equips professionals to meet the demands of the JN0-351 exam.
Topic 2	Protocol Independent Routing: An essential domain for understanding routing components outside protocol dependencies, this topic enhances expertise in configuring, monitoring, and troubleshooting critical elements.
Topic 3	Spanning Tree: Networking professionals explore the principles and advantages of the Spanning Tree Protocol (STP) to ensure loop-free topologies in Layer 2 networks.
Topic 4	High Availability: This topic covers the importance and application of high availability within Junos OS environments. Knowledge in configuring and managing these components is critical for ensuring robust and uninterrupted network operations, aligning with exam expectations.
Topic 5	IS-IS: Aspiring Juniper networking professionals enhance their understanding of IS-IS routing protocols. This topic equips candidates with the knowledge to configure and monitor IS-IS systems, addressing specific exam challenges and practical applications.
Topic 6	OSPF: The concepts and operational details of OSPF are explored, providing tools for routing efficiency. Configuration and troubleshooting mastery ensure readiness for both the exam and complex enterprise environments.
Topic 7	Layer 2 Security: This topic introduces Layer 2 protection mechanisms and firewall filters to fortify network security. Practical skills in configuring, monitoring, and troubleshooting these features prepare candidates to address exam objectives and real-world challenges effectively.

Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q189-Q194):

NEW QUESTION # 189
You are an operator for a network running IS-IS. Two routers are failing to form an adjacency.
What are two reasons for this problem? (Choose two.)

A. There are mismatched router IDs on the L2 routers.
B. There is a mismatched area ID between the L2 routers.
C. There is no configured ISO address on any IS-IS interface.
D. The family iso configuration is missing from the adjacency interface.

Answer: C,D

Explanation:
The two reasons for the failure to form an adjacency in a network running IS-IS could be:
B) There is no configured ISO address on any IS-IS interface. IS-IS requires each router interface to have an ISO address configured. Without this address, the routers cannot form an adjacency.
D) The family iso configuration is missing from the adjacency interface. The 'family iso' configuration is essential for IS-IS to function correctly. If this configuration is missing from the adjacency interface, it could prevent the formation of an adjacency.
These explanations are based on the Enterprise Routing and Switching Specialist (JNCIS-ENT) documents and learning resources available at Juniper Networks.

NEW QUESTION # 190
Which two statements about the firewall filter terms shown in the exhibit are true? (Choose two.)

A. Traffic that matches the fromstatement in term oneis accepted.
B. Traffic matching the fromstatement in term twois logged.
C. Traffic that matches the fromstatement in term oneis discarded.
D. All traffic not matching the fromstatement in term oneis accepted by term two.

Answer: A,D

NEW QUESTION # 191
You are concerned about spoofed MAC addresses on your LAN.
Which two Layer 2 security features should you enable to minimize this concern? (Choose two.)

A. IP source guard
B. dynamic ARP inspection
C. DHCP snooping
D. static ARP

Answer: B,C

Explanation:
* A is correct because dynamic ARP inspection (DAI) is a Layer 2 security feature that prevents ARP spoofing attacks. ARP spoofing is a technique that allows an attacker to send fake ARP messages to associate a spoofed MAC address with a legitimate IP address. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DAI validates ARP packets by checking the source MAC address and IP address against a trusted database, which is usually built by DHCP snooping 1 . DAI discards any ARP packets that do not match the database or have invalid formats 1 .
* C is correct because DHCP snooping is a Layer 2 security feature that prevents DHCP spoofing attacks. DHCP spoofing is a technique that allows an attacker to act as a rogue DHCP server and offer fake IP addresses and other network parameters to unsuspecting clients. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DHCP snooping filters DHCP messages by classifying switch ports as trusted or untrusted. Trusted ports are allowed to send and receive any DHCP messages, while untrusted ports are allowed to send only DHCP requests and receive only valid DHCP replies from trusted ports 2 . DHCP snooping also builds a database of MAC addresses, IP addresses, lease times, and binding types for each client 2 .

NEW QUESTION # 192
You are troubleshooting an issue where traffic to 192.168.10.0/24 is being sent to R1 instead of your desired path through R2.
Referring to the exhibit, what is the reason for the problem?

A. R2's route is not the best path due to a lower origin code.
B. R1's route is the best path due to the shorter AS path.
C. R1's route is the best path due to a higher local preference
D. R2's route is not the best path due to loop prevention.

Answer: C

Explanation:
The exhibit shows the output of the command show ip bgp, which displays information about the BGP routes in the routing table. The output shows two routes for the destination 192.168.10.0/24, one from R1 and one from R2.
The route from R1 has a local preference of 200, while the route from R2 has a local preference of 100. Local preference is a BGP attribute that indicates the degree of preference for a route within an autonomous system (AS). A higher local preference means a more preferred route.
BGP uses a best path selection algorithm to choose the best route for each destination among multiple paths. The algorithm compares different attributes of the routes in a specific order of precedence. The first attribute that is compared is weight, which is a Cisco-specific attribute that is local to the router. If the weight is equal or not set, the next attribute that is compared is local preference.
In this case, both routes have the same weight of 0, which means that they are learned from external BGP (eBGP) peers. Therefore, the next attribute that is compared is local preference.
Since R1's route has a higher local preference than R2's route, it is chosen as the best path and installed in the routing table. The other attributes, such as origin code and AS path, are not considered in this case.

NEW QUESTION # 193
Based on the traceoptions output shown in the exhibit, what is the problem with the adjacency?

A. MTU mismatch
B. area mismatch
C. connectivity
D. authentication mismatch

Answer: B

NEW QUESTION # 194
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